We have only been using the Dexcom for one month and have a couple of questions: 1) Any tips on getting more than a week out of the sensor? After I re-start the sensor after 7 days, it almost never lasts much longer. I have gotten many of the ??? symbol or I get very inaccurate readings. My son wears it on the arm. I would love to get longer out of the sensors, especially since we do not have insurance coverage. We do tape it down when it starts pulling up. Should I try a different location on his body? I am thinking belly, but we use it a lot for sites. 2) What do you do when you get very inaccurate readings? Last night the Dexcom kept alarming me that my son was low (like 7 or 8 times). He was never low. I got no sleep at all because of the false alarms. I entered his bg in several times last night to correct the readings and still kept getting wrong readings. Then today, the readings were way off again. The sensor was on it's 8th day, so just ended up pulling the sensor off. I considered just re-starting the sensor to get more life out of it, but thought it probably wouldn't change things. Any experience with these issues would be much appreciated. Thanks!